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Goodwill and Other Intangible Assets - Summary of Changes in Carrying Value of Goodwill (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Initial value of PistonHeads acquisition $ 15,521
Foreign currency translation adjustment 341
Purchase price adjustment (655) [1]
Balance at December 31, 2019 $ 15,207
[1] The purchase price adjustment corresponds to an adjustment for the deferred tax liability as a result of the Company’s evaluation of income tax treatment, which was recorded during the second quarter of 2019.